Electricity is pulsing through Spain and Portugal again after a massive outage knocked out power in both countries on Monday. So too are questions.

Spain's electricity grid operator Red Electrica said it was able to supply virtually all of the country's electricity demand early on Tuesday as the system gradually recovers from a nationwide blackout on Monday,

Spanish electricity grid operator Red Eléctrica has ruled out cyberattack as the reason for the power blackout that struck the Iberian Peninsula on Monday. Red Eléctrica system operations director Eduardo Prieto said analyses conducted thus far meant that a "cybersecurity incident is ruled out.